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Old 04-20-2015, 02:22 PM   #1
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Failsafe Engine Mode

I recently bought an '05 GT w/ 47,000 miles on it and some work done to it i.e. supercharger, headers, and some cosmetic work. Of course the cocksucker didn't tell me that the failsafe engine mode comes on weekly damn near. Some days the car fires up perfectly, other days it automatically goes into failsafe mode. I've also noticed that when I begin driving it initially through the neighborhood (slow) and gas it just enough for the blower to add a little boost, that it will hesitate big time and sputter and pop, then it kind of fixes itself and either drives fine or goes into failsafe mode. I've changed the sparkplugs, the complete TB, and had it retuned. Any thoughts and help is appreciated.

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Old 04-20-2015, 02:26 PM   #2
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I recently bought an '05 GT w/ 47,000 miles on it and some work done to it i.e. supercharger, headers, and some cosmetic work. Of course the cocksucker didn't tell me that the failsafe engine mode comes on weekly damn near. Some days the car fires up perfectly, other days it automatically goes into failsafe mode. I've also noticed that when I begin driving it initially through the neighborhood (slow) and gas it just enough for the blower to add a little boost, that it will hesitate big time and sputter and pop, then it kind of fixes itself and either drives fine or goes into failsafe mode. I've changed the sparkplugs, the complete TB, and had it retuned. Any thoughts and help is appreciated.

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Who did the tune? How much psi of boost are You getting, stock plugs or a step colder? Gapped properly?
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Old 04-20-2015, 02:32 PM   #3
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The tune was done on a dyno in Wilmington, NC by a reputable racing shop. The plugs are motocraft and a step colder. I gapped them to .32

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---------- Post added at 07:32 PM ---------- Previous post was at 07:31 PM ----------

3lbs boost currently

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Old 04-20-2015, 02:34 PM   #4
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Did you run the codes? It should have some if it is in failsafe mode
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Old 04-20-2015, 02:46 PM   #5
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The codes is see most often are2104, P2106, P2112, P0121, and P2135

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---------- Post added at 07:46 PM ---------- Previous post was at 07:46 PM ----------

Not sure where the smiley face came from! WTF

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Old 04-20-2015, 03:32 PM   #6
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http://www.allfordmustangs.com/forum.../topics/234009
Give that a quick Read
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Old 04-20-2015, 03:44 PM   #7
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Thanks Nate, I did the complete swap of TB an it didn't fix my issue. My next step is to have the PCM updated because there was a TSB released for it. I'm not certain this update was installed. My issue happens mostly on startup, occasionally I'll be driving down the road and it damn near shuts off completely and almost causes a NASCAR pileup on the highway.

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Old 04-20-2015, 03:50 PM   #8
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Thanks Nate, I did the complete swap of TB an it didn't fix my issue. My next step is to have the PCM updated because there was a TSB released for it. I'm not certain this update was installed. My issue happens mostly on startup, occasionally I'll be driving down the road and it damn near shuts off completely and almost causes a NASCAR pileup on the highway.

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And the tuner used the proper pcm code right? I know that can send the car into safe mode. Outside of that your next best guess would be a pcm update or replacement like you said. Also how are you only getting 3 pounds of boost?
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Old 04-20-2015, 04:13 PM   #9
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Its the lowest pulley setting for the kenne bell. Its closer to 4psi actually. The tuner said to stay with that PSI on the 4.6 V8 or youre begging for problems. It getting 437 with the current set up. I have another tune that was dynoed at 450.

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Old 04-20-2015, 05:08 PM   #10
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Nate, are you running a blower?

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Old 04-20-2015, 05:28 PM   #11
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No sir I am not. I didn't realize the kb out down that much, typically supercharger setups are in the 6-8 psi range.
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Old 04-20-2015, 06:00 PM   #12
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Mine would randomly go into fail safe mode. I replaced the whole throttle body & it would still do it. So after living with it for awhile I decided to go to Ford & pickup a TPS to try it. It hasn't gone into fail safe since. There is an updated version of the sensor.
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Old 04-20-2015, 06:02 PM   #13
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Failsafe Engine Mode

Wow Nate, good job taking the lead on this one.

I agree with everything that's been said. Defiantly sounds like a tune issue.. If not that then the TBS is worth looking into. Sounds like you got a really nice ride and it just needs a little tweaking.

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Old 04-20-2015, 07:05 PM   #14
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On the Dyno we noticed that it was only boosting to right at 4 psi. You are correct though Nate, the KB advertises the beginning PSI at 6 to give you 501 HP. The tuner was adamant about not pushing the 4.6 to 500hp. Unless I rebuilt the lower end.

S281, I replaced the TB with a new Ford Racing TB complete with TPS/Throttle actuator. Isnt that the same TPS?

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Old 04-20-2015, 08:01 PM   #15
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Thanks for the replies guys, I take all of your comments seriously.

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Old 04-20-2015, 08:06 PM   #16
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And this will sound silly, but make sure the supercharger is nice and snug everywhere, especially the elbow.
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Old 04-20-2015, 09:15 PM   #17
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Failsafe Engine Mode

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Originally Posted by natestang07 View Post
And this will sound silly, but make sure the supercharger is nice and snug everywhere, especially the elbow.

He would probably have a lean code if he had a leak.


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Old 04-20-2015, 09:21 PM   #18
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He would probably have a lean code if he had a leak.


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Very true. I forgot the codes were listed lol.
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Old 04-20-2015, 09:24 PM   #19
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The more I read the more I like the pcm reflash idea
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Old 04-20-2015, 09:28 PM   #20
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Actually I have a funny story about that. When I dynoed the car the first time we noticed it wasn't making any boost. Come to find out, when it was trying to boost, the valve that creates boost/vacuum, was being blocked by a hose clamp. The hose clamp was tightened enough to wear the excess was preventing the boost valve from working properly. We bent it back and re-dynoed it and instantly 150 more HP.

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Old 04-20-2015, 10:04 PM   #21
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I agree Nate, another step in the process of elimination. I will do it this week and post updates.

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Old 04-20-2015, 10:13 PM   #22
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I agree Nate, another step in the process of elimination. I will do it this week and post updates.

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The list of things that causes the failsafe mode is ridiculously long. Keep us updated though.
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Old 04-21-2015, 08:00 AM   #23
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Will do

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Old 05-02-2015, 04:43 PM   #24
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I had the PCM updated. Now I have to send my SCT tuner in to have it unlocked so I can install the custom tune. The tuner no longer recognizes the PCM currently.

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Old 07-05-2015, 10:19 PM   #25
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Got the tuner back from SCT, uploaded the tunes and the problem was still there. Checked the MAF sensor and noticed a screw was missing from it, this means that there was possibly some air escaping and not completely entering the sensor. A ford tech said this could be problematic so I fixed that. Drove her today and she acted fine.

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Old 07-05-2015, 10:20 PM   #26
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Could a MAF sensor air leak really cause the car to go into Failsafe Engine Mode?

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Old 07-05-2015, 10:49 PM   #27
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I suppose it could

---------- Post added at 08:49 PM ---------- Previous post was at 08:48 PM ----------

Especially when running a blower
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Old 06-25-2016, 11:00 PM   #28
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Well...after a few thousand dollars I finally figured out the Failsafe Engine Mode problem...a 30 cent piece of vacuum hose...it was a significant vacuum leak all along. Car is running like a dream...I have 9 lbs boost because the boost gauge is reading it accurately now...451 HP to the rear wheels now...Holy **** that took me a year and a half to figure out!

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